WO2013153818A1

WO2013153818A1 - Contact device and electromagnetic switch using same

Info

Publication number: WO2013153818A1
Application number: PCT/JP2013/002474
Authority: WO
Inventors: 鹿志村　修; 磯崎　優; 幸悦高谷; 雄二柴
Original assignee: 富士電機機器制御株式会社; 富士電機株式会社
Priority date: 2012-04-13
Filing date: 2013-04-11
Publication date: 2013-10-17
Also published as: CN104221115B; EP2838099A1; KR20140145143A; US9508509B2; JP2013222562A; US20150022291A1; EP2838099A4; CN104221115A; JP5990028B2

Abstract

Provided are a contact device and an electromagnetic switch using said contact device that are capable of easily extinguishing an arc generated between a fixed contact element and a movable contact element when said contact device is open. Said contact device is provided with: a pair of fixed contact elements (6a, 6b) that, maintaining a specified interval, are fixed in place in an arc-extinguishing chamber; and the movable contact element (11), which is arranged so as to enable attachment to/removal from the pair of fixed contact elements. An arc root movement promotion section (12) is formed on the movable contact element (11), said arc root movement promotion section (12) promoting movement of the root of the arc generated when the contact device is open, at which the movable contact element separates from the pair of fixed contact elements.

Description

Contact device and electromagnetic switch using the same

The present invention relates to a contact device including a stationary contact and a movable contact inserted in a current path and an electromagnetic switch using the contact device, and occurs when the stationary contact and the movable contact are opened, that is, when a current is interrupted. The arc is extinguished easily.

Conventionally, as a contact device that opens and closes a current path, in an electromagnetic relay, an electromagnetic contactor, etc., the current is cut off from the closed state of the contact mechanism in contact with the fixed contact and the movable contact to be opened. Various contact mechanisms have been proposed for extinguishing an arc generated during opening of a pole that separates the movable contact from the fixed contact.
For example, a pair of fixed contacts each having a fixed contact disposed at a predetermined distance away from each other, and a movable contact having a movable contact at left and right ends disposed so as to be able to contact with and separate from the pair of fixed contacts An electromagnetic switching device comprising an electromagnet device for driving the movable contact and an enclosing member for housing the movable contact and the stationary contact, and an arc extinguishing permanent magnet arranged in parallel to the moveable contact on the outside of the enclosing member An apparatus has been proposed (see, for example, Patent Document 1).

JP 2006-19148 A

However, in the conventional example described in Patent Document 1, it is easy to extinguish the arc by stretching the arc by the magnetic force of the permanent magnet, but it is possible to move the movable contact from the input state in which the movable contact is in contact with the fixed contact. The legs of the arc generated at the time of interrupting the current that separates the child, that is, at the time of opening, move the movable contact of the movable contact to the arc extinguishing space side by the magnetic force of the permanent magnet. There is an unsolved problem that the electric field strength is lowered due to the metal vapor generated from the arc foot while the foot of the moving arc stays at the corner of the movable contact, and the interruption performance is lowered, for example, the arc is repeatedly re-ignited.
Accordingly, the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and a contact device that can easily extinguish an arc generated between a fixed contact and a movable contact at the time of opening. And it aims at providing the electromagnetic switch using this.

In order to achieve the above object, a first aspect of the contact device according to the present invention includes a pair of fixed contacts fixedly arranged in the arc extinguishing chamber at a predetermined interval, and the pair of fixed contacts. And a movable contact arranged so as to be able to contact and separate. The movable contact is provided with an arc foot movement promoting portion that promotes movement of an arc foot generated at the time of opening away from the pair of fixed contacts in a direction away from the fixed contact. .

According to the first aspect, an arc is generated between the movable contact and the pair of fixed contacts when the movable contact is separated from the pair of fixed contacts. At this time, since the arc foot movement promoting portion is formed on the movable contact, the arc foot generated by the arc foot movement promoting portion can be moved away from the fixed contact without staying at the corner. . Therefore, the electric field strength at the time of arc generation becomes large, and it is possible to suppress the recurrence of the arc and improve the interruption performance.

In addition, a second aspect of the contact device according to the present invention is an inclined surface in which the arc foot movement promoting portion becomes thinner as it goes to the end portion in a direction perpendicular to the current flow direction of the movable contact. It is configured.
According to the second aspect, since the inclined surface such as the tapered surface or the arc surface whose thickness decreases as it goes to the step portion in the direction orthogonal to the current flow direction of the movable contact, the inclined surface is formed. The downward movement of the arc foot is promoted.

Moreover, as for the 3rd aspect of the contact device which concerns on this invention, the said inclined surface is comprised by the taper surface.
According to the third aspect, since the inclined surface is a tapered surface, it is possible to easily form the movable contact having the arc foot movement promoting portion.
In a fourth aspect of the contact device according to the present invention, the inclined surface is formed by an arcuate curved surface.
According to the fourth aspect, since the inclined surface is an arcuate curved surface, no corner is formed before the movable contactor reaches the bottom surface side, and the arc foot is easily and reliably moved. be able to.

Moreover, the 5th aspect of the contact apparatus which concerns on this invention is an opposite side to the said pair of stationary contact side which the said arc leg movement promotion part formed in the end surface orthogonal to the electric current flow direction of the said movable contact. It consists of an arc runner that protrudes and extends.
According to this 5th aspect, an arc runner is provided as an arc leg movement promotion part, and this arc runner is projected and extended on the opposite side to a pair of fixed contacts of a movable contact. For this reason, since the legs of the arc generated at the time of opening are moved in the direction away from the fixed contact without staying at the corners, the electric field strength at the time of arc generation is increased to suppress recurring arcs and improve the breaking performance be able to.

Moreover, the 6th form of the contact apparatus which concerns on this invention is formed so that the said arc runner may cover the side surface of the said movable contact.
According to the sixth aspect, when the leg of the arc generated at the time of opening reaches the corner of the movable contact, it is surely moved downward along the arc runner, thereby improving the breaking performance. I can do it.

Further, according to a seventh aspect of the contact device of the present invention, the arc runner has an inwardly inclined protrusion on the side of the movable contact opposite to the pair of fixed contacts.
In the seventh aspect, since the movable contact of the arc runner is inclined inward on the side opposite to the fixed contact, the arc foot can be extended to the lower side of the movable contact, and the arc extinguishing can be performed. The space can be expanded and the volume can be used effectively.

According to an eighth aspect of the contact device of the present invention, the arc runner is configured such that a protruding portion of the movable contact opposite to the pair of fixed contacts is inclined outward.
According to the eighth aspect, since the arc runner is inclined outward on the lower side of the movable contact, the distance between the arc foot of the fixed contact is increased by extending the arc foot in a direction that is easy to spread. Can do.

In the ninth aspect of the contact device according to the present invention, the arc runner has a protruding portion of the movable contact opposite to the pair of fixed contacts that extends outwardly.
According to the ninth aspect, the arc runner can widen the arc leg outward and the distance between the fixed contact and the arc leg can be increased.

A first aspect of the electromagnetic switch according to the present invention includes the contact device according to the first to ninth aspects, wherein the movable contact is connected to a movable iron core of an electromagnet device, and the fixed contact is externally provided. Connected to the connection terminal.
According to this configuration, it is possible to provide an electromagnetic switch capable of improving the interrupting performance by reliably extinguishing an arc generated at the time of opening with a simple configuration.

According to the present invention, since the arc foot movement accelerating portion that moves the foot of the arc generated at the opening of the movable contact in the direction away from the fixed contact is formed, the arc generated at the time of opening the angle of the movable contact The electric field strength between the arc feet stays at the portion and falls below the arc voltage, so that reignition between the electrodes in the vicinity of the arc feet is surely prevented and the interruption performance can be improved.
In addition, by applying the contact device having the above effects to an electromagnetic switch, an electromagnetic contactor, an electromagnetic relay, etc. that can easily extinguish an arc generated at the time of opening with a simple configuration and improve a breaking performance. An electromagnetic switch can be provided.

It is sectional drawing which shows 1st Embodiment at the time of applying this invention to an electromagnetic contactor. FIG. 2 is a schematic cross-sectional view along the line AA in FIG. 1. FIG. 3 is a cross-sectional view taken along line BB in FIG. It is explanatory drawing with which it uses for description of arc extinguishing by the permanent magnet for arc extinguishing. It is typical sectional drawing which shows the modification of the 1st Embodiment of this invention. It is typical sectional drawing which shows the other modification of the 1st Embodiment of this invention. It is typical sectional drawing which shows the 2nd Embodiment of this invention. It is typical sectional drawing which shows the 1st modification of the 2nd Embodiment of this invention. It is a typical sectional view showing the 2nd modification of a 2nd embodiment of the present invention. It is a typical sectional view showing the 3rd modification of a 2nd embodiment of the present invention. It is a typical sectional view showing the 4th modification of a 2nd embodiment of the present invention. It is a typical sectional view showing the 5th modification of a 2nd embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view showing an example in which the contact device of the present invention is applied to an electromagnetic contactor as an electromagnetic switch. In FIG. 1, 1 is an exterior case made of, for example, a synthetic resin. The exterior case 1 includes a bottomed cylindrical body 1a whose lower end surface is opened and a bottom plate 1b that closes the lower end surface of the bottomed cylindrical body 1a.
In the exterior case 1, a contact device 2 having a contact mechanism and an electromagnet unit 3 as an electromagnet device for driving the contact device 2 are accommodated in a relationship in which the electromagnet unit 3 is arranged on the bottom plate 1b.

2 and 3, the contact device 2 has an arc extinguishing container 4. The arc extinguishing container 4 is a bowl-shaped body 4a having a lower end formed of ceramics, synthetic resin or the like. And a metal joining member 4b that is tightly fixed to the open end surface thereof, and a metal cylinder 4c that covers the side surface of the bowl-shaped body 4a. The joining member 4b is fixed to the upper surface of the upper magnetic yoke 22 of the electromagnet unit 3 in an airtight state by brazing, welding, or the like.

On the upper surface of the bowl-shaped body 4a, through holes 5a and 5b having a circular cross section are provided in the longitudinal direction at a predetermined interval, and a pair of, for example, copper fixed

contacts

6a and 6b are inserted into the through holes 5a and 5b. It is fixed by brazing or adhesive.
Each of the fixed

contacts

6 a and 6 b is composed of an upper-side large-diameter head 7 and a lower-side small-diameter cylindrical portion 8 that is coaxially connected to the large-diameter head 7.
These fixed

contacts

6a, 6b seal the through holes 5a, 5b by brazing, adhesive, or the like to the rod-like body 4a in a state where the small-diameter cylindrical portion 8 is inserted into the through-holes 5a, 5b of the rod-like body 4a. It is fixed to.

In the contact device 2, the movable contact 11 is opposed to the lower end surfaces of the small-diameter cylindrical portions 8 of the fixed

contacts

6a and 6b so that the movable contact 11 can be contacted and separated with a relatively narrow predetermined gap. As shown in FIG. 2, the movable contact 11 has a flat surface 11a formed at least at a position facing the fixed

contacts

6a and 6b. The movable contact 11 is formed with an arc foot movement promoting portion 12 in a direction orthogonal to the longitudinal direction of the movable contact 11 on the flat surface 11a, that is, on the front and rear end side. The arc foot movement promoting portion 12 is composed of inclined surfaces, that is, tapered

surfaces

12 a and 12 b, whose thickness gradually decreases from the front and rear end portions of the flat surface 11 a toward the front and rear end portions of the movable contact 11.

The movable contact 11 is attached to the contact holder 13 by being urged upward by a contact spring 14. The contact holder 13 is connected to a movable iron core 25 of the electromagnet unit 3 described later and is driven in the vertical direction.
Further, external

connection terminal plates

15a and 15b are screwed to the large-diameter heads 7 of the fixed

contacts

6a and 6b.
Further, as shown in FIG. 3, magnet

housing cylinder portions

16a and 16b are formed on the inner peripheral surface of the bowl-shaped body 4a facing the side surface orthogonal to the longitudinal direction of the movable contact 11, and these magnet

housing cylinder portions

16a and 16a are formed. The arc extinguishing

permanent magnets

17a and 17b are accommodated in 16b. These arc extinguishing

permanent magnets

17a and 17b are magnetized such that the inner peripheral surfaces facing each other are N poles and the outer peripheral surfaces are magnetized S poles.

The left and right spaces of the magnet

housing cylinder portions

16a and 16b are

arc extinguishing spaces

18a and 18b, respectively.
A gas such as hydrogen gas, nitrogen gas, a mixed gas of hydrogen and nitrogen, air, SF ₆ or the like is sealed in the arc extinguishing container 4 including the bowl-shaped body 4a, the joining member 4b, and the metal cylinder 4c. .
The electromagnet unit 3 has a U-shaped magnetic yoke 21 as viewed from the side, and a cylindrical portion 21 b having a lower end opened at the center of the bottom plate portion 21 a of the magnetic yoke 21. The upper surface side of the magnetic yoke 21 is connected by the upper magnetic yoke 22.

A coil holder 24 around which an exciting coil 23 is wound is mounted on the outer peripheral surface of the cylindrical portion 21b of the magnetic yoke 21, and a bottomed cylindrical shape in which a movable iron core 25 is slidably mounted on the inner peripheral surface of the cylindrical portion 21b. A cap 26 is provided. A rubber seat 27 that contacts the bottom surface of the movable iron core 25 and absorbs an impact when the movable iron core 25 is lowered is disposed on the bottom surface of the cap 26.

A connecting shaft 28 is fitted to the center of the movable iron core 25, and the head of the connecting shaft 28 extends upward through a through hole 29 formed in the upper magnetic yoke 22 and is connected to the contact holder 13. Yes.
Further, a spring insertion hole 30 is formed around the connecting shaft 28 of the movable iron core 25, and a return spring 31 for biasing the movable iron core 25 downward is mounted between the spring insertion hole 30 and the upper magnetic yoke 22. Yes.

Next, the operation of the above embodiment will be described.
Now, it is assumed that the external connection terminal plate 15a is connected to a power supply source that supplies a large current, for example, and the external connection terminal plate 15b is connected to a load.
In this state, it is assumed that the excitation coil 23 in the electromagnet unit 3 is in a non-energized state and no excitation force for moving the movable iron core 25 by the electromagnet unit 3 is generated. In this state, the movable iron core 25 is urged downward by the return spring 31 away from the upper magnetic yoke 22 and comes into contact with the rubber seat 27. For this reason, the movable contact 11 supported by the contact holder 13 connected to the movable iron core 25 via the connecting shaft 28 sandwiches a predetermined gap from the lower end surface of the small diameter cylindrical portion 8 of the fixed

contacts

6a and 6b. The contact device 2 is in an open (released) state.

When the exciting coil 23 of the electromagnet unit 3 is energized from the open state of the contact device 2, an exciting force is generated by the electromagnet unit 3 to push the movable iron core 25 upward against the return spring 31. In response to this, the contact holder 13 connected to the movable iron core 25 via the connecting shaft 28 moves upward, and the movable contact 11 contacts the bottom surface of the small-diameter cylindrical portion 8 of the fixed

contacts

6a and 6b. Contact with a contact pressure of 14.

For this reason, a closed state (input) state in which a large current i of the external power supply source is supplied to the load through the external connection terminal plate 15a, the fixed contact 6a, the movable contact 11, the fixed contact 6b, and the external connection terminal plate 15b. It becomes.
When the current supply to the load is cut off from the closed state of the contact device 2, the voltage application to the exciting coil 23 of the electromagnet unit 3 is stopped.

Thereby, the exciting force that moves the movable iron core 25 upward by the electromagnet unit 3 disappears, and the movable iron core 25 is lowered by the biasing force of the return spring 31. When the movable iron core 25 is lowered, the contact holder 13 connected via the connecting shaft 28 is lowered. The movable contact 11 is in contact with the fixed

contacts

6a and 6b while a contact pressure is applied by the contact spring 14 in accordance with the lowering of the contact holder 13. Thereafter, when the contact pressure of the contact spring 14 disappears, the movable contact 11 is brought into a contact opening start state in which the movable contact 11 is separated downward from the fixed

contacts

6a and 6b.

In this opening start state, an arc is generated between the fixed

contacts

6a and 6b and the movable contact 11. At this time, the opposing magnetic pole surfaces of the arc extinguishing

permanent magnets

17a and 17b are N poles, and the outer side is the S pole. For this reason, as shown in FIG. 4A, the magnetic flux emitted from the N pole is obtained at each of the opposing portions of the arc extinguishing

permanent magnets

17a and 17b, the stationary contact 6a and the movable contact 11, as shown in FIG. A magnetic field is formed by crossing the arc generating portion from the inside to the outside in the longitudinal direction of the movable contact 11 and reaching the south pole.

Similarly, the arc generating portion of the contact portion of the fixed contact 6b and the contact portion of the movable contact 11 traverses in the longitudinal direction of the movable contact 11 from the inside to the outside and reaches the S pole to form a magnetic field.
Therefore, the magnetic fluxes of the arc extinguishing

permanent magnets

17a and 17b are both opposite to each other in the longitudinal direction of the movable contact 11 between the fixed contact 6a and the movable contact 11 and between the fixed contact 6b and the movable contact 11. Will cross.

For this reason, between the fixed contact 6a and the movable contact 11, as shown in FIG. 4B, the current I flows from the fixed contact 6a side to the movable contact 11 side (to the upper surface side), The direction of the magnetic flux Φ is the left direction from the inside toward the outside. Therefore, according to Fleming's left-hand rule, as shown in FIG. 4C, the arc extinction is perpendicular to the longitudinal direction of the movable contact 11 and perpendicular to the opening / closing direction of the fixed contact 6a and the movable contact 11. A large Lorentz force F toward the arc space 18b acts.

This Lorentz force F causes an arc generated between the stationary contact 6a and the movable contact 11 to reach the lower surface side of the movable contact 11 from the side surface of the stationary contact 6a through the arc extinguishing space 18b. Is greatly stretched to extinguish the arc.
Further, in the arc extinguishing space 18b, the direction of the magnetic flux between the fixed contact 6a and the movable contact 11 is uniform on the lower side and the upper side, and the current direction differs depending on the extension of the arc. For this reason, depending on the direction of the current, the arc stretched in the arc extinguishing space 18b is stretched so that it further spreads in the direction of the corner of the arc extinguishing space 18b, the arc length can be lengthened, and good interrupting performance can be achieved. Obtainable.

On the other hand, between the fixed contact 6b and the movable contact 11, as shown in FIG. 4 (b), the current I flows from the movable contact 11 side to the fixed contact 6b side and flows toward the near side, and the magnetic flux. The direction of Φ is the right direction from the inside to the outside. Therefore, according to Fleming's left-hand rule, as shown in FIG. 4C, the arc extinction is perpendicular to the longitudinal direction of the movable contact 11 and perpendicular to the opening / closing direction of the fixed contact 6b and the movable contact 11. A large Lorentz force F toward the arc space 18b acts.

The arc generated between the fixed contact 6b and the movable contact 11 by this Lorentz force F reaches the side of the fixed contact 6b from the upper surface side of the movable contact 11 through the arc extinguishing space 18b. As shown in FIG.
Further, in the arc extinguishing space 18b, as described above, the direction of the magnetic flux between the fixed contact 6b and the movable contact 11 is uniform on the lower side and the upper side, and the direction of the current is caused by the extension of the arc. Different. For this reason, the arc stretched in the arc extinguishing space 18b by the direction of the current is further stretched in the direction of the corner of the arc extinguishing space 18b, the arc length can be increased, and good interruption performance can be obtained. .

On the other hand, when the electromagnetic contactor 10 is closed (turned on) and a regenerative current is flowing from the load side to the DC power supply side and the release state is set, the direction of the current in FIG. Therefore, the same arc extinguishing function is exhibited except that the Lorentz force F acts on the arc extinguishing space 18a side and the arc is stretched on the arc extinguishing space 18a side.
At this time, since the arc extinguishing

permanent magnets

17a and 17b are disposed in the magnet

housing cylinder portions

16a and 16b formed in the bowl 4a of the arc extinguishing container 4, the arc is directly arc extinguishing permanent magnet. There is no contact with 17a and 17b. For this reason, the magnetic characteristics of the arc extinguishing

permanent magnets

17a and 17b can be stably maintained, and the interruption performance can be stabilized.

When the movable contact 11 starts to move away from the fixed

contacts

6a and 6b and an arc is generated, the arc is extinguished by the magnetic force of the arc extinguishing

permanent magnets

17a and 17b as described above, depending on the direction of the current. 18b is stretched.
At this time, an arc foot movement promoting portion 12 is formed on the side surface side of the movable contact 11. For this reason, when the arc is stretched to the

arc extinguishing space

18a or 18b by the magnetic force of the arc extinguishing

permanent magnets

17a and 17b, the arc leg is fixed by the tapered

surface

12a or 12b formed on the movable contact 11. From the position facing the

contacts

6a and 6b, it moves outward and downward along the tapered

surface

12a or 12b.

Therefore, the distance between the arc leg of the

taper surface

12a or 12b of the movable contact 11 and the other leg of the arc formed on the fixed

contacts

6a and 6b is increased, which is affected by metal vapor or the like. Without increasing the electric field strength. For this reason, it is possible to reliably prevent a re-occurring arc from occurring between the electrodes in the vicinity of the arc foot of the movable contact 11 and improve the interruption performance.

Incidentally, if the movable contact 11 is a flat surface on which the tapered

surfaces

12a and 12b are not formed, an arc generated between the movable contact 11 and the fixed

contacts

6a and 6b on the movable contact 11 side. When the arc leg is stretched toward the arc extinguishing space 18b by the magnetic force of the arc extinguishing

permanent magnets

17a and 17b, the arc leg remains at the corner between the flat surface and the side surface. For this reason, if the distance between the fixed

contacts

6a and 6b and the arc legs remains short, the electric field strength between the arc legs may be lowered to an arc voltage or less due to metal vapor or the like. As a result, a recurring arc is generated between the electrodes in the vicinity of the arc foot, and the interruption performance is reduced.

At this time, by making the arc extinguishing space below the movable contact 11 large, the arc foot can easily move to the surface of the movable contact 11 opposite to the fixed

contacts

6a and 6b and can easily extend. Therefore, the blocking performance can be further improved.
As described above, according to the first embodiment, since the arc foot movement promoting portion 12 including the tapered

surfaces

12a and 12b is formed on the side surface orthogonal to the longitudinal direction of the movable contact 11, the movable contact 11 is fixed. It is possible to easily move the foot on the movable contact side of the arc generated at the time of opening apart from the

contacts

6a and 6b along the tapered surface 12a (or 12b). For this reason, the distance between the arc legs generated between the movable contact 11 and the fixed

contacts

6a and 6b is increased to increase the electric field strength, thereby preventing re-arcing and quickening the arc extinction to improve the interruption performance. be able to.

Furthermore, when the arc is appropriately extinguished, the gap between the fixed

contacts

6a and 6b and the movable contact 11 can be narrowed, and the opening time for cutting off the current can be shortened. it can.
In the first embodiment, the case has been described in which the portion of the fixed

contacts

6a and 6b facing the movable contact 11 is the small-diameter cylindrical portion 8. However, the present invention is not limited to this. As shown in FIG. 5, the contact portions of the fixed

contacts

6a and 6b facing the movable contact 11 may be formed on the curved surface 41 having a spherical or cylindrical shape. In this case, the legs of the arc also move upward on the fixed

contacts

6a and 6b side, the distance between the arc legs can be made longer, and the arc is extinguished more reliably and the interruption performance. Can be further improved.

Moreover, in the said 1st Embodiment, although the case where the arc leg movement promotion part 12 was formed in

taper surface

12a, 12b was demonstrated, it is not limited to this, As shown in FIG. The arcuate

curved surfaces

42a and 42b that form a part of the curved surface may be used. In this case, as the arc foot moves outward along the arcuate

curved surfaces

42a and 42b, the distance between the

stationary contact

6a and 6b and the arc foot can be increased, and the interruption performance is further improved. Can be made.

Next, a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, an arc runner is provided as an arc foot movement promoting portion instead of the inclined surface.
That is, in the second embodiment, as shown in FIG. 7, an arc runner 51 a that covers the side surface in a direction orthogonal to the longitudinal direction of the movable contact 11 having a rectangular cross section and extends downward from the lower surface of the movable contact 11, 52b is fixed. Here, each of the

arc runners

51a and 51b may be formed of an arc-resistant material such as tungsten (W) or silver (Ag), or a metal material having conductivity such as copper (Cu).

About another structure, it has the same structure as 1st Embodiment mentioned above, the same code | symbol is attached | subjected to the corresponding part with FIG. 2, and the detailed description is abbreviate | omitted.
According to the second embodiment, as in the first embodiment described above, when the movable contact 11 is opened away from the fixed

contacts

6a and 6b, the distance between the movable contact 11 and the fixed

contacts

6a and 6b is increased. The arc generated at the arc extinguishing

permanent magnets

17a and 17b is stretched toward the arc extinguishing space 18a (or 18b).

At this time, the arc leg on the movable contactor 11 side moves to the side of the arc runner 51a (or 51b) as the arc leg is extended to the arc extinguishing space 18a (or 18b) side, and the arc leg moves to the arc runner. When 51a (or 51b) is reached, it will rapidly move downward along this arc runner 51a (or 51b). For this reason, the legs of the arc do not stay at the corners of the side surface of the movable contact 11, and the distance between the fixed

contacts

6a and 6b and the legs of the arc is lengthened to prevent the electric field strength from being lowered due to metal vapor or the like. be able to. Therefore, the arc can be easily extinguished and the interruption performance can be improved.

In the second embodiment, the case where the

arc runners

51a and 51b are formed so as to cover the side surfaces of the movable contactor 11 is described. However, the present invention is not limited to this, and both

arc runners

51a and 51b are used. Alternatively, the upper end portions may be connected by a connecting portion 51c to form an inverted U-shaped cross section. In this case, a groove 52 extending in the front-rear direction is formed on the surface of the movable contact 11 facing the fixed

contacts

6a and 6b, and the connecting portion 51c is engaged with and fixed to the groove 52. Thus, by forming the arc runner in an inverted U shape, the arc foot can be smoothly moved at the connecting portion 51c and can be easily fixed to the movable contactor 11. .

Further, as shown in FIG. 9, an arc runner 53 formed in an inverted U shape may be fixed to the lower surface side of the movable contact 11. Even in this case, when the arc is stretched by the arc extinguishing

permanent magnets

17a and 17b and reaches the end portion on the side surface side of the movable contact 11, the arc foot does not stay at the end portion, but on the lower surface side. It is drawn to the formed arc runner 53. For this reason, the distance between the arc leg on the movable contact 11 side and the arc leg of the fixed

contacts

6a and 6b can be lengthened, and the electric field strength between the arc legs can be increased to improve the interruption performance.

Furthermore, as shown in FIG. 10, the

arc runners

54a and 54b on the lower surface side of the movable contactor 11 may be bent inward and inclined inward. In this case, the arc foot of the movable contact 11 can be moved to the lower surface side of the movable contact 11, and the lower side of the movable contact 11 can be used as an arc extinguishing space. The stretched length can be increased to facilitate arc extinction, and the volume can be effectively used.

Moreover, as shown in FIG. 11, the

arc runners

55a and 55b on the lower side of the movable contactor 11 may be bent outward and inclined outward as opposed to FIG. In this case, the arc foot can be moved in the direction in which the arc is easily spread on the lower surface side of the movable contact 11. The arc foot can be moved reliably and the arc can be easily extinguished.
Furthermore, as shown in FIG. 12, the

arc runners

56a and 56b on the lower side of the movable contactor 11 may be bent outward in a right angle direction and protrude outward. Also in this case, similarly to FIG. 11, the arc foot can be moved in the direction in which the arc easily spreads on the lower surface side of the movable contact 11, and the arc foot can be reliably moved to easily extinguish the arc. be able to.

Also in the second embodiment, as in the first embodiment described above, the surfaces of the fixed

contacts

6a and 6b facing the movable contact 11 are formed in a spherical shape or a cylindrical surface shape. Also good.
In the first and second embodiments, the case where the arc extinguishing

permanent magnets

17a and 17b are arranged inside the rod-shaped body 4a has been described. However, the present invention is not limited to this. The arc

permanent magnets

17a and 17b may be arranged outside the bowl-shaped body 4a in parallel with the movable contactor 11.

Moreover, although the said 1st and 2nd embodiment demonstrated the case where the arc-extinguishing container 4 was comprised by the rod-shaped body 4a, the joining member 4b, and the metal cylinder 4c, it is not limited to this, A metal An insulating cylinder may be arranged inside the made cage, and any configuration can be adopted.
Further, in the first and second embodiments, the case where gas is sealed in the arc extinguishing container 4 has been described. However, the present invention is not limited to this, and when the current value to be cut off is small, the gas is sealed. Can be omitted.

Moreover, in the said 1st and 2nd embodiment, although the case where the shape of the movable contact 11 was formed in flat form in the longitudinal direction was demonstrated, it is not limited to this, The movable contact 11 The central part between the contact parts facing the fixed

contacts

6a, 6b may be formed in a concave or convex shape.
Furthermore, in the said 1st and 2nd embodiment, although the case where the movable contact 11 opposes the fixed

contacts

6a and 6b from the lower side was demonstrated, it is not limited to this, The fixed contact 6a And 6b may be arranged on the lower side of the arc extinguishing container 4, and the movable contact 11 may be opposed to the contact parts from the upper side.

Furthermore, the configuration of the electromagnet unit 3 is not limited to the above embodiment, and any configuration can be applied as long as the contact holder 13 can be moved by electromagnetic force.
Furthermore, in the said embodiment, although the case where the contact apparatus 2 of this invention was applied to an electromagnetic contactor was demonstrated, it is not limited to this, Arbitrary switches including an electromagnetic relay and another electromagnetic switch Can be applied to.

Industrial application fields

According to the present invention, the arc foot movement promoting part is formed that moves the foot of the arc generated when the movable contact is opened in a direction away from the fixed contact. Therefore, it is possible to provide a contact device that can easily extinguish an arc generated between the fixed contact and the movable contact at the time of opening, and an electromagnetic switch using the contact device.

DESCRIPTION OF SYMBOLS 1 ... Exterior case, 2 ... Contact device, 3 ... Electromagnet unit, 4 ... Arc-extinguishing container, 4a ... Casing-like body, 4b ... Joining member, 4c ... Metal cylinder, 6a, 6b ... Fixed contact, 11 ... Movable contact Child, 12 ... arc foot movement promoting portion, 12a, 12b ... tapered surface, 13 ... contact holder, 14 ... contact spring, 15a, 15b ... external connection terminal plate, 21 ... magnetic yoke, 22 ... upper magnetic yoke, 23 ... Excitation coil, 24 ... coil holder, 25 ... movable iron core, 26 ... cap, 28 ... connecting shaft, 31 ... return spring, 51a, 51b ... arc runner, 51c ... connecting portion, 53 ... arc runner, 54a, 54b, 55a, 55b, 56a, 56b ... Arc Runner

Claims

A pair of fixed contacts fixedly arranged in the arc extinguishing chamber at a predetermined interval;
A movable contact disposed so as to be able to contact and separate from the pair of fixed contacts;
The movable contact is formed with an arc foot movement accelerating portion that promotes movement of an arc foot generated at the time of opening away from the pair of fixed contacts in a direction away from the fixed contact. Contact device.
2. The arc foot movement promoting portion is configured by an inclined surface that decreases in thickness as it goes to an end portion in a direction orthogonal to a current flow direction of the movable contact. Contact device.
3. The contact device according to claim 2, wherein the inclined surface is constituted by a tapered surface.
3. The contact device according to claim 2, wherein the inclined surface is formed of an arcuate curved surface.
The arc foot movement promoting part is composed of an arc runner that protrudes and extends to the opposite side to the pair of fixed contact sides formed on an end surface orthogonal to the current flow direction of the movable contact. The contact device according to claim 1.
The contact device according to claim 5, wherein the arc runner is formed so as to cover a side surface of the movable contact.
The contact device according to claim 5 or 6, wherein the arc runner has a protruding portion of the movable contact opposite to the pair of fixed contacts inclined inward.
The contact device according to claim 5 or 6, wherein the arc runner has a protruding portion of the movable contact opposite to the pair of fixed contacts inclined outward.
The contact device according to claim 5 or 6, wherein the arc runner has a protruding portion of the movable contact opposite to the pair of fixed contacts that protrudes outward.
The contact device according to any one of claims 1 to 9, wherein the movable contact is connected to a movable iron core of an electromagnet device, and the fixed contact is connected to an external connection terminal. Features an electromagnetic switch.